CN102588413B - Grounding bolt and manufacture method for same - Google Patents
Grounding bolt and manufacture method for same Download PDFInfo
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- CN102588413B CN102588413B CN201110463093.8A CN201110463093A CN102588413B CN 102588413 B CN102588413 B CN 102588413B CN 201110463093 A CN201110463093 A CN 201110463093A CN 102588413 B CN102588413 B CN 102588413B
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Abstract
The invention relates to a grounding bolt and a manufacture method for the same. The grounding bolt comprises a bolt head and a screw, wherein the outer diameter of part of a thread on the screw is squeezed towards the bottom diameter direction, so that the size of a cross section at a pitch diameter position of the thread becomes larger. The manufacture method for the grounding bolt includes the steps: processing the thread on a thread rolling machine, arranging two elongated slots at the rear end of a fixed thread rolling plate, inlaying pressing strips into the two elongated slots in an interference fit manner, wherein one end of each pressing strip extends out of the fixed thread rolling plate, and the height h of an extension end of each pressing strip higher than the bottom diameter of a thread rolling die plate is two tenths-third tenth of that of a normal thread. The grounding bolt has the advantages that the cross section size of the pitch diameter of the thread at a squeezed position of the grounding bolt becomes larger, so that the grounding bolt is closely matched with a screw hole, and grounding or electrifying is achieved without poor contact. The manufacture method for the grounding bolt has the advantages of high generation efficiency and low cost only by adding the pressing strips on the fixed thread rolling plate.
Description
Technical field
The present invention relates to a kind of bolt and manufacture method thereof, relate in particular to earth stud and the manufacture method thereof on a kind of vehicle, used.
Background technique
As everyone knows, earth stud comprises bolt head and screw rod, and central diameter is not pushed at the tooth line place of the screw part of common earth stud, not tight with coordinating of screw, does not reach the effect of ground connection and energising, can produce bad phenomenon.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, and a kind of and earth stud that screw closely cooperates, earthing effect is good and manufacture method thereof are provided.
The present invention solves the problems of the technologies described above adopted technological scheme: a kind of earth stud, comprise bolt head and screw rod, and at the bottom of the outer radial of the part screw thread on described screw rod, footpath direction is squeezed, and makes the cross-sectional dimension at effective diameter of thread place become large.
A kind of manufacture method of earth stud, it is machining screw on thread-rolling machine, thread-rolling machine is provided with moving flat die roll and quiet flat die roll, on the rear end of quiet flat die roll, offer two elongated slots, article two, the distance L between elongated slot is half of external diameter girth of screw thread of being squeezed, near the elongated slot side of quiet flat die roll end, apart from the distance D of terminal surface, deduct the width B of elongated slot for the external diameter girth of the screw thread that is not squeezed, in two elongated slots, interference fit is bumped into press strip, quiet flat die roll is stretched out in press strip one end, press strip external part exceeds 0.2～0.3 times that the height h in footpath at the bottom of quiet flat die roll is the screw thread tooth depth that is not squeezed, the length A of press strip matches with the length of the screw thread that is squeezed, external part is provided with chamfering a in the both sides of thickness direction, the process step of machining screw is as follows: 1, the front end of quiet flat die roll is the process of screw forming, 2, the rear end of quiet flat die roll is that the cross-sectional dimension at thread-rolling screw central diameter place becomes large process, 3, the end of quiet flat die roll is to guarantee not to be squeezed standard measure and the logical only requirement of screw thread.
Useful technique effect of the present invention is: earth stud of the present invention is because the part screw thread on screw rod is squeezed, the cross-sectional dimension of central diameter of place's screw thread of making to be squeezed becomes large, reduced or eliminated the gap while coordinating with screw, earth stud and screw are closely cooperated, reach ground connection or energising effect, can not produce the phenomenon of bad connection, reduce application risk; Manufacture method of the present invention only increases press strip on quiet flat die roll, has the advantages that generation efficiency is high, cost is low.
accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the I portion enlarged view of Fig. 1;
Fig. 3 is the right elevation of the tail cutting slot of Fig. 1;
Fig. 4 is the structural representation of quiet flat die roll of the present invention;
Fig. 5 is the left view of Fig. 4;
Fig. 6 is the C-C cutaway view Amplified image of Fig. 5;
Fig. 7 is the structural representation of press strip of the present invention;
Fig. 8 is the II portion enlarged view of Fig. 7;
embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
As Figure 1-3, a kind of earth stud, comprises bolt head 1 and screw rod 2, and at the bottom of the outer radial of the part screw thread on described screw rod 2, footpath direction is squeezed, and makes cross section 3 sizes at effective diameter of thread place become large.
The tooth depth size H of the screw thread of the described part that is squeezed is the screw thread tooth depth H1 that is not squeezed 0.7～0.8 times, it is just in time suitable that cross section 3 sizes of controlling effective diameter of thread place become large amount.
Described screw rod end is provided with three uniform tail cutting slots 4, and tail cutting slot 4 can be rejected the rubbish in screw or paint, is convenient to be threaded into.
A kind of manufacture method of earth stud, it is machining screw on thread-rolling machine, thread-rolling machine is provided with moving flat die roll and quiet flat die roll, as Figure 4-8, on the rear end 10 of quiet flat die roll, offer two elongated slots, be elongated slot 5 and elongated slot 6, distance L between elongated slot 5 and elongated slot 6 is half of external diameter girth of screw thread of being squeezed, near the side of the elongated slot 6 of quiet flat die roll end, apart from the distance D of terminal surface 7, deduct the width B of elongated slot for the external diameter girth of the screw thread that is not squeezed, in two elongated slots, interference fit is bumped into press strip 8, quiet flat die roll is stretched out in press strip 8 one end, press strip 8 external parts exceed 0.2～0.3 times that the height h in footpath at the bottom of quiet flat die roll is the screw thread tooth depth that is not squeezed, the length A of press strip 8 matches with the length of the screw thread that is squeezed, external part is provided with chamfering a in the both sides of thickness direction, the process step of machining screw is as follows: 1, the front end 9 of quiet flat die roll is the process of screw forming, 2, the rear end 10 of quiet flat die roll is that the cross-sectional dimension at thread-rolling screw central diameter place becomes large process, 3, the end 11 of quiet flat die roll is to guarantee not to be squeezed standard measure and the logical only requirement of screw thread.
Described press strip 8 is made by Hardmetal materials, and moving flat die roll and quiet flat die roll are made by high speed steel M2 material.Manufacture method of the present invention is higher to the required precision of thread-rolling machine, and the parallelism of the slider seat of moving flat die roll and quiet flat die roll need guarantee that gap is at 0.01-0.03mm in 0.03mm.
Be the relevant parameters setting of earth stud M6 below:
The external diameter of screw thread of being squeezed is 5.4mm, and the external diameter of the screw thread that is not squeezed is 5.8mm, and the screw thread tooth depth that is not squeezed is 0.44mm, and the width B of elongated slot is 2mm.So, the distance L between elongated slot 5 and elongated slot 6 is be squeezed half of external diameter girth of screw thread, i.e. L=5.4 * 3.14/2=8.48mm; Near the side of the elongated slot 6 of quiet flat die roll end, apart from the distance D of terminal surface 7, deduct the width B of elongated slot for the external diameter girth of the screw thread that is not squeezed, be D=5.8 * 3.14-2=16.21mm, press strip 8 external parts exceed 0.25 times that the height h in footpath at the bottom of quiet flat die roll is the screw thread tooth depth that is not squeezed, be h=0.44 * 0.25=0.11mm, chamfering a=30 °.
Claims (2)
1. a manufacture method for earth stud, is machining screw on thread-rolling machine, and thread-rolling machine is provided with moving flat die roll and quiet flat die roll, described earth stud, comprise bolt head and screw rod, at the bottom of the outer radial of the part screw thread on described screw rod, footpath direction is squeezed, make the cross-sectional dimension at effective diameter of thread place become large, it is characterized in that: on the rear end of quiet flat die roll, offer two elongated slots, article two, the distance L between elongated slot is half of external diameter girth of screw thread of being squeezed, near the elongated slot side of quiet flat die roll end, apart from the distance D of terminal surface, deduct the width B of elongated slot for the external diameter girth of the screw thread that is not squeezed, in two elongated slots, interference fit is bumped into press strip, quiet flat die roll is stretched out in press strip one end, press strip external part exceeds 0.2～0.3 times that the height h in footpath at the bottom of quiet flat die roll is the screw thread tooth depth that is not squeezed, the length A of press strip matches with the length of the screw thread that is squeezed, external part is provided with chamfering a in the both sides of thickness direction, the process step of machining screw is as follows: 1, the front end of quiet flat die roll is the process of screw forming, 2, the rear end of quiet flat die roll is that the cross-sectional dimension at thread-rolling screw central diameter place becomes large process, 3, the end of quiet flat die roll is to guarantee not to be squeezed standard measure and the logical only requirement of screw thread.
2. the manufacture method of a kind of earth stud according to claim 1, is characterized in that: described press strip is made by Hardmetal materials, and moving flat die roll and quiet flat die roll are made by high speed steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110463093.8A CN102588413B (en) | 2011-12-13 | 2011-12-13 | Grounding bolt and manufacture method for same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110463093.8A CN102588413B (en) | 2011-12-13 | 2011-12-13 | Grounding bolt and manufacture method for same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102588413A CN102588413A (en) | 2012-07-18 |
| CN102588413B true CN102588413B (en) | 2014-04-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110463093.8A Active CN102588413B (en) | 2011-12-13 | 2011-12-13 | Grounding bolt and manufacture method for same |
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| Country | Link |
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| CN (1) | CN102588413B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105269271A (en) * | 2015-11-27 | 2016-01-27 | 宁波敏达机电有限公司 | Three-section type cylindrical bolt processing technique |
| CN105344897B (en) * | 2015-11-27 | 2016-08-24 | 宁波敏达机电有限公司 | Screw cylinder bolt and processing dental lamina thereof |
| CN105299015B (en) * | 2015-11-27 | 2016-10-12 | 宁波敏达机电有限公司 | Paint tooth bolt processing dental lamina scraped by band |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2371365A (en) * | 1942-12-07 | 1945-03-13 | American Screw Co | Locking screw and method of making |
| US3520344A (en) * | 1968-07-17 | 1970-07-14 | Eric G Gabbey | Self-locking screw thread |
| GB2198801B (en) * | 1986-12-19 | 1991-02-20 | Masco Ind Inc | Locking fastener |
| AU1531697A (en) * | 1996-01-18 | 1997-08-11 | Implant Innovations, Inc. | Reduced friction screw-type dental implant |
| CN201461690U (en) * | 2009-07-21 | 2010-05-12 | 任旭辉 | Bolt |
| CN202391914U (en) * | 2011-12-13 | 2012-08-22 | 温州市长江标准件有限公司 | Earthing bolt |
-
2011
- 2011-12-13 CN CN201110463093.8A patent/CN102588413B/en active Active
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| Publication number | Publication date |
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| CN102588413A (en) | 2012-07-18 |
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Addressee: Wenzhou Changjiang Standard Part Co., Ltd. Document name: Notification of Passing Examination on Formalities |